platform/mellanox: Remove redundant 'NULL' check

Remove 'NULL' check for 'data->hpdev.client' in error flow of
mlxreg_lc_probe(). It cannot be 'NULL' at this point.

Fixes: b4b830a3  ("platform/mellanox: mlxreg-lc: Fix error flow and extend verbosity")
Reported-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NVadim Pasternak <vadimp@nvidia.com>
Link: https://lore.kernel.org/r/20220823201937.46855-5-vadimp@nvidia.comReviewed-by: NHans de Goede <hdegoede@redhat.com>
Signed-off-by: NHans de Goede <hdegoede@redhat.com>

drivers/platform/mellanox/mlxreg-lc.c

@@ -893,10 +893,8 @@ static int mlxreg_lc_probe(struct platform_device *pdev)
 regcache_sync_fail:
 regmap_write_fail:
 devm_regmap_init_i2c_fail:
-	if (data->hpdev.client) {
-		i2c_unregister_device(data->hpdev.client);
-		data->hpdev.client = NULL;
-	}
+	i2c_unregister_device(data->hpdev.client);
+	data->hpdev.client = NULL;
 i2c_new_device_fail:
 	i2c_put_adapter(data->hpdev.adapter);
 	data->hpdev.adapter = NULL;